Time base error corrector

Details Time base error corrector Time base error corrector

1977-06-08

1978-10-03

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 8, 358127, 178 691, 360 36, 307232, 328164, H04N 504, H04N 576, H04N 700, H04N 578

Patent

active

041187385

ABSTRACT:
A time base error corrector for correcting time base errors in recurrent information such as horizontal lines of a video signal by random selection of a delay line tap is disclosed. Incoming recurrent information groups are converted into impulse trains, in which the information is carried on the leading edges of the impulses, which are passed asynchronously through a delay line of plural cascaded digital gates having propagation delays which provide known tapped increments of delay as well as providing regeneration of each impulse passing therethrough. A digital counter is clocked at a rate corresponding to said delay increments and counts the time base error of a train as it counts down the taps of said line. The total reached in counting the time base error determines the tap through which the impulse train is output from the delay line. A restoration circuit then restores the original signal format to the corrected information group.

REFERENCES:
patent: 3419681 (1968-12-01), Bopp et al.
patent: 3748386 (1973-07-01), Monney et al.
patent: 3763317 (1973-10-01), Coleman, Jr. et al.
patent: 3860952 (1975-01-01), Tallant et al.
patent: 3994013 (1976-11-01), Lennoine et al.
patent: 4054903 (1977-10-01), Niaomiya

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